First Engine Teardown Ever... Why Is Something Missing?

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Nick87James

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• Oct 10, 2012

• #1

I just started tearing down my xs 650 engine out of my 81 special, and after taking off the covers i discovered there is no ignition advance unit.... Is this a common occurance?
And why would the previous owner remove this?
Please be gentle if I am overlooking something...Thanks

 

Ghetto

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• Oct 10, 2012

• #2

81 is CDI. No advance unit needed.

 

Adrenaline-Junkie

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• Oct 10, 2012

• #3

After 79 points wasnt used anymore so theres no advance unit.

 

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Nick87James

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• Oct 10, 2012

• #4

Ghetto said:

81 is CDI. No advance unit needed.

Click to expand...

I appreciate the quick response, its my first XS so i am just starting to understand what I have...

 

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Nick87James

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• Oct 10, 2012

• #5

Can you guys tell me why I keep hearing about the Pamco ignition system? What are the advantages over the stock? just more spark?

 

Adrenaline-Junkie

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• Oct 10, 2012

• #6

Pamco is an affordable and more reliable system for the xs650 since the stock systems are pretty lacking. A Pamco ignition with a PMA setup is pretty standard around here when it comes to redoing an engine. Both the guy who makes the Pamco ignition and the guy that makes one of the most popular PMA systems are members on this forum. PamcoPete and Punkskalar (Hugh).

http://www.yamahaxs650.com/

http://hughshandbuilt.blogspot.com/p/xs650-permanent-magnet-alternator.html

 

azman857

'80 XS 650SG Rider

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• Oct 10, 2012

• #7

The PAMCO is a very reliable points or TMI box replacement. Easy to install too. Former TCI motors will need to get an ATU to make it work. Use the search feature to research more info and form your own opinion.

 

wherearewe

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• Oct 10, 2012

• #8

This would be a good kit. Comes with what you need to convert the TCI motor to Pamco, as well as better dual ignition coil.

 

wherearewe

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• Oct 10, 2012

• #9

http://www.mikesxs.net/product/14-0912.html

Sorry didnt link

 

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Tomterrific

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• Oct 10, 2012

• #10

The stock TCI unit is a quality electronic ignition that uses an electronic advance instead of the mechanical advance of points ignition. A working TCI need not be changed!

Tom

 

Last edited: Oct 10, 2012

XSLeo

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• Oct 13, 2012

• #11

Also just to be stickler the electronic ignition used on the XS650 was never a CDI, It was a TCI.
The CDI is a Capacitive Discharge Ignition. It works by charging a big capacitor, then discharging it through the coil to create the spark.
On the TCI or Transister Controled Ignition, it works very simular to the points. It controls current flow through the coil with a transister instead of the points. It has alot of other things in the box, like timing advance as well as circuits to protect itself from to high a voltage.
The points open and close, the transiter turns on and off, both turn the coil on off.
Now as others have siad the points were used from 70-79, in 80 they started using the TCI. Here in the US anyway. Other places used the points a few years later.
Leo